"The situation in Syria is a shame for Europe. It is easy to point at the Russians and the Americans. But the Europeans have failed themselves, because they have not taken responsibility [for it]… Europe could have promised investments worth tens of billions to recover Syria if the ceasefire was observed," Ischinger told Germany's Handelsblatt newspaper on Monday.
According to the diplomat, military solutions to the crisis, such as a no-fly zone in Syria cannot be ruled out as well.
Syria has been mired in civil war since 2011, with government forces loyal to President Bashar Assad fighting a number of opposition factions and extremist groups.
On September 9, Russian Foreign Minister Sergey Lavrov and US Secretary of State John Kerry presented a new plan to regulate the conflict, which included a new ceasefire that came into force on September 12.
On September 19, the Syrian army declared the end of ceasefire regime, blaming militants for numerous violations that made the cessation of hostilities unreasonable.